Hi Jason, hi Joerg!
cocoon.createPageLocal() was exactly what I've been looking for. Thanks a lot!
@Joerg: what you said about the difference between values of variables and
references to objects is true for saving them in the PageLocal-Object.
In Continuations Flowscript-Variables seem to be only referenced as well.
This proves this little sample:
function main()
{
var random = Math.round( Math.random() * 9 ) + 1;
var hint = "Noch keine Eingaben.";
var guesses = 0;
while(true)
{
cocoon.sendPageAndWait("guess.jxt", {"random" : random, "hint" : hint,
"guesses" : guesses});
var guess = parseInt(cocoon.request.get("guess"));
guesses++;
if(guess>random)
{
hint = "Nö, niedriger!";
}
else if(guess<random)
{
hint = "Nö, höher!";
}
else
{
break;
}
}
cocoon.sendPage("success.jxt", {"guess" : guess, "random" : random,
"guesses" : guesses});
}
The Variable "guesses" works as a counter and is not set back if you're
navigating backwards with Continuations.
But using the PageLocal-object solves my problem.
And I have another question:
How can I serialize the contents of a CForms-Datamodel which you get from
formObject.getModel()
Into the PageLocal-Object?
I mean, dynamically, without knowing the ids of the widgets,
Something like:
[pseudocode]
...
dataModel = formObject.getModel();
for (var key in dataModel)
{
pageLocalObj.key = dataModel.key;
}
...
Or could you tell me the path to the sources, please, where I could look for
implemented methods or something? I couldn't find it...
Regards,
Franzi
-----Ursprüngliche Nachricht-----
Von: Jason Johnston [mailto:[EMAIL PROTECTED]
Gesendet: Donnerstag, 12. April 2007 22:46
An: [EMAIL PROTECTED]
Betreff: Re: Continuations: Snapshot or Pointers?
On Thu, 12 Apr 2007 21:41:06 +0200, Joerg Heinicke <[EMAIL PROTECTED]> wrote:
> On 12.04.2007 16:02, Franziska Witzani wrote:
>
>> According to the documentation I have (especially the book of Stephan
>> Niedermeier), a continuation is a snapshot of the variables of the
>> flowscript (by the time the continuation is created/saved) and a pointer
> to
>> the point of the flowscript which actually is being executed.
>>
>> I experienced, that this is not exactly the case. What seems to be saved
>> within the continuation is not a snapshot of the variables, but only
>> pointers to their values.
>>
>> (For example, if you have a counter, which is incremented after each
>> "sendPageAndWait()" it will not be set back if you go back with
>> continuations, but always hold the highest value.)
>
> They are indeed pointers, not snapshots. But this is only true for
> objects. AFAIK there is no way to point to a primitive type, they are
> always passed by value, not by reference. This means a simple counter
> should indeed be resetted going back to an old continuation. But
> somebody else can correct me on this. Torsten?
>
>> Is there a way to change that by configuring something, or will I have
> to
>> change the Cocoon-source code or find another way around it?
>
> No, there is no way to configure it. Actually I wonder how this should
> be possible at all. How do you want to store and restore an object? I
> can only imagine serializing and deserializing objects, but I'm not
> aware of such an implementation. It would probably quite nice as you
> don't need to care about any object state, but it's limiting to a
> certain extend (to Serializable actually) and maybe not well performing.
I've never tried using it, but if I understand the Flowscript documentation
correctly, cocoon.createPageLocal() will create an object that restores its
state at the time the continuation was created. Franziska this may fill your
need.
--Jason
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
